Перевірити результат. Урок хімії школи. Тестові трубки з різнокольоровими речовинами. Шкільна лабораторія. Групові школярі вивчають хімічні рідини. Дівчата і хлопчик студент проводить шкільний експеримент з рідинами . - Стокове фото та зображення

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